JP2008151979A - Rod holding tool and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rod holding tool capable of fixing a light guiding rod and a light shield in such a state that the outer periphery of the light guiding rod is brought into contact with the light shield, and a projector equipped therewith. <P>SOLUTION: The projector has a light source device, the light guiding rod 81, a color wheel, a light source side optical system, a display device, a projection side optical system, a cooling fan and a projector control means, and further is equipped with the rod holding tool 130 for fixing the light guiding rod 81 in the housing of the projector. The rod holding tool 130 has a plurality of light shields 132 fixed on the side surface of the end of a rod placing table 131 and brought into tight-contact with the periphery of the light guiding rod 81 placed and fixed on the rod placing table 131. The plurality of light shields 132 is equipped with a rod tight-contact part 143 having the same shape as a part of the side surface of the light guiding rod 81. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rod holder including a light shielding plate and a projector including the rod holder.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen.

  This data projector incorporates a high-intensity light source device such as a metal highland lamp or an ultra-high pressure mercury lamp, and condenses the light emitted from this light source on a micromirror display element called DMD which is a horizontally long rectangular shape. A color image is displayed on a screen. This micromirror display element has a plurality of rotatable micromirrors arranged in a matrix, and light incident from an incident direction inclined in one direction with respect to the front direction is tilted by the plurality of micromirrors. By switching the direction, the image is displayed by separately reflecting the on-state light beam in the front direction and the off-state light beam in the oblique direction.

  In this projector, the light emitted from the discharge lamp is generally collected by a reflector having a spheroidal shape or a parabolic shape. Since the light beam emitted from the reflector is condensed into a circular shape, it is necessary to make this circular light beam a light beam that matches the shape of the micromirror display element.

  In order to match the circular light beam to the shape of the micromirror display element, it is generally performed by a rectangular parallelepiped light guide device disposed after the light source device. However, among the light beams emitted from the light source device, there is light that does not enter the incident surface of the light guide device, and such light becomes stray light and adversely affects the projected image.

In order to solve this problem, many proposals have been made that include a mask for blocking unnecessary light such as stray light in the vicinity of the incident surface of the projection image. For example, in Japanese Patent Application Laid-Open No. 2006-65202 (Patent Document 1), by arranging a mask having a rhombus opening in the vicinity of an incident surface of a light guide device, unnecessary light is blocked and an outer frame shape of a projection image is formed. There is a proposal that can be made into a horizontally long rectangular shape.
JP 2006-65202 A

  When a mask is arranged in the vicinity of the incident surface of the light guide device, a gap is formed between the opening of the mask and the incident surface of the light guide device, and light transmitted through the gap becomes stray light and adversely affects the projected image. There was a problem. Similarly, when a mask having an opening having the same shape as the outer shape of the light guide device is placed on the light guide device, a gap is formed between the outer periphery of the light guide device and the mask opening. There was a problem.

  The present invention has been made in view of the problems of the prior art as described above, and a rod holder that can fix the light guide rod and the light shielding plate in a state where the outer periphery of the light guide rod and the light shielding plate are in close contact with each other. An object of the present invention is to provide a projector including the rod holder.

  The rod holder of the present invention includes a rod mounting table, and a plurality of light shielding plates that are fixed to an end side surface of the rod mounting table and are in close contact with a periphery of a light guide rod that is mounted and fixed on the rod mounting table. It is characterized by this.

  The rod mounting table includes a pedestal portion for mounting the light guide rod and a rod support portion for supporting the light guide rod mounted on the pedestal portion, and shields the ends of the pedestal portion and the rod support portion. The light-shielding plate fixing portion formed at the end of the pedestal portion includes a fixture receiver and a support protrusion that supports the adjustment when the fixing positions of the light-shielding plates are adjusted. The light-shielding plate fixing part formed at the end of the part is provided with a fixture receiver.

  Further, a step is provided between the light shielding plate fixing portion of the pedestal portion and the light shielding plate fixing portion of the rod support portion, and the plurality of light shielding plates are fixed in an overlapping manner.

  The plurality of light shielding plates include a rod close contact portion having the same shape as a part of a side surface of the light guide rod.

  The light shielding plate has two light shielding plates, a first light shielding plate and a second light shielding plate, and the first light shielding plate has a disc shape and is cut by a notch cut at a right angle to the outer periphery. An L-shaped rod contact portion is provided, and the second light shielding plate is an L-shaped plate-like body, and the inner side is a rod contact portion.

  Furthermore, the light shielding plate includes a fixing tool through hole through which the fixing tool passes, and an adjustment notch for locking with a support protrusion formed on the pedestal portion, and the fixing tool through hole has the fixing tool inserted therein. Sometimes it has play between the periphery of the fixture.

  The projector according to the present invention includes a light source device, a light guide rod and a rod holder, a color wheel, a light source side optical system, a display element, a projection side optical system, a cooling fan, and a projector control means. The rod holder includes a rod mounting table, and a plurality of light shielding plates fixed to an end side surface of the rod mounting table and in close contact with a periphery of a light guide rod mounted and fixed on the rod mounting table. It is characterized by having.

  In addition, a predetermined one of the plurality of light shielding plates is disposed behind the color wheel to form a part of a wheel cover.

  ADVANTAGE OF THE INVENTION According to this invention, the projector provided with the rod holder which can fix a light guide rod and a light-shielding plate in the state which the outer periphery of the light-guide rod and the light-shielding plate were closely_contact | adhered, and the said rod holder can be provided. .

  The projector 1 of the best mode for carrying out the present invention includes a light source device 61, a color wheel 86, a light guide rod 81, a light source side optical system 70, a display element 51, a projection side optical system 90, A cooling fan 111 and projector control means 101 are provided.

  In addition, the projector 1 has a rod holder 130 that fixes the light guide rod 81 to the housing of the projector 1, and this rod holder 130 is fixed to the end side surface of the rod mounting table 131, and the rod mounting table 131. A plurality of light shielding plates 132 that are in close contact with the periphery of the light guide rod 81 that is placed and fixed to the light guide rod 81. The plurality of light shielding plates 132 are rods having the same shape as a part of the side surface of the light guide rod 81. The close contact portion 143 is provided.

  The rod mounting table 131 includes a pedestal portion 133 for mounting the light guide rod 81 and a rod support portion 134 for supporting the light guide rod 81 mounted on the pedestal portion 133. The pedestal portion 133 and the rod support portion The end portion of 134 is a first light shielding plate fixing portion 136a, and the light shielding plate fixing portion 136 formed at the end portion of the pedestal portion 133 is adjusted when the fixing positions of the fixture receiver 137a and the plurality of light shielding plates 132 are adjusted. The second light-shielding plate fixing part 136b formed at the end of the rod support part 134 is provided with a fixture receiver 137b.

  Further, a step is provided between the first light shielding plate fixing portion 136a of the pedestal portion 133 and the second light shielding plate fixing portion 136b of the rod support portion 134, and the plurality of light shielding plates 132 are overlapped and fixed. .

  The light shielding plate 132 includes two light shielding plates 132, a first light shielding plate 141 and a second light shielding plate 142. The first light shielding plate 141 has a disc shape and is cut at a right angle to the outer periphery. The notch has an L-shaped rod close-contact portion 143a, and the second light shielding plate 142 is an L-shaped plate-like body having an inner side as a rod close-contact portion 143b.

  Further, the light shielding plate 132 includes a fixing tool through hole 144 through which the fixing tool passes, and an adjustment notch 145 to be engaged with the support protrusion 138 formed on the pedestal 133, and the fixing tool through hole 144 is fixed. When the tool is inserted, there is play between the periphery of the fixture.

  Note that a predetermined one of the plurality of light shielding plates 132 is disposed behind the color wheel 86 and forms a part of the wheel cover.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A projector 1 according to the present invention incorporates a control circuit as a projector control means, and has a projection port 93 provided with a lens cover 92 on a front plate 3 of a case that is a substantially rectangular parallelepiped as shown in FIG. It is.

  On the top plate 2 of the case, there are keys and indicators such as a power switch 10, a manual image quality adjustment key 12, an automatic image quality adjustment key 13, a power lamp indicator 11, a light source lamp indicator 14, an overheat indicator 15, and a speaker. It has a loudspeaker hole 16 and an open / close lid 17 on the inside, and a back plate (not shown) inputs various signals such as a power connector, a USB terminal connected to a personal computer, a video terminal for video signal input, and a mini D-sub terminal. It has a terminal.

  The upper opening / closing lid 17 has sub-keys for fine adjustment of image quality and image and various operation settings of the projector 1, an intake hole on the left side plate of the case, and an exhaust hole 8 on the right side plate 5. Is provided and has a cooling fan inside.

  In addition, the front plate 18 has a front foot member 18 that can adjust the amount of protrusion, and the rear plate has a fixed rear foot member 19 on the left and right of the bottom plate. By changing the front height of the projector 1, an image can be projected according to the height of the screen.

  As shown in FIG. 2, the control circuit as the projector control means of the projector 1 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. Thus, the image signals of various standards input from the input / output connector unit 21 are unified into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted to, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 61 is incident on the display element 51 through various optical systems such as a light guide rod and a light source side optical system, thereby forming an optical image with the reflected light of the display element 51 and the projection side optical An image is projected and displayed on a screen (not shown) via a system, and the movable lens group 97 of the projection side optical system is driven by a lens motor 45 for zoom adjustment and focus adjustment.

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls operation of each circuit in the projector 1, and includes a ROM that stores operation programs such as a CPU and various settings in a fixed manner, and a RAM that is used as a work memory. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 2 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts the audio data into analog data in the projection mode and the playback mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls a power supply control circuit 41. The power supply control circuit 41 turns on the discharge lamp of the light source device 61 when the lamp switch key is operated. Further, the control unit 38 also controls a cooling fan drive control circuit 43. The cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 61, etc. The rotation speed is controlled and the rotation of the cooling fan is continued even after the lamp of the light source device 61 is turned off by a timer or the like. Further, depending on the result of temperature detection by the temperature sensor, the light source device 61 is stopped and the projector body It also performs control such as turning off the power of the.

  As shown in FIG. 3, a circuit board 103 provided with projector control means 101 and a lamp power supply circuit 102 is disposed in the vicinity of the front plate 3 inside the projector 1. A cooling fan 111 is disposed in the vicinity of the exhaust hole 8 of the right side plate 5 and in the vicinity of the back plate 4. Further, a plurality of air intake holes 9 are formed in the left side plate 6 so that outside air can be taken into the projector 1.

  Further, a light source device 61 incorporating a discharge lamp 62 such as a high-pressure halogen lamp, a light source side optical system 70 composed of a color wheel 86, a light guide rod 81, a plurality of light source side lens groups, and the like, and a reflection mirror It has 88 mag.

  A display element 51 that displays an image by controlling the reflection of incident light by arranging a plurality of pixels in a matrix in the row direction and the column direction at a position where the reflected light from the reflecting mirror 88 is irradiated. Has been placed. A projection-side optical system 90 including a fixed lens group 98 and a movable lens group 97 that project light emitted from the display element 51 onto a projection surface such as a screen is disposed in the vicinity of the left side plate 6.

  The display element 51 is a display element 51 that does not have a means for coloring incident light such as a color filter. In this embodiment, a micromirror display element generally abbreviated as DMD (Digital Micromirror Device) is used. . The horizontal to vertical ratio of the micromirror display element is usually 4 to 3.

  The micromirror display element is configured to convert light incident from an incident direction tilted in one direction with respect to the front direction into front-state on-state rays and oblique off-state rays by switching the tilt directions of the plurality of micromirrors. The light is incident on the micromirror tilted in one tilt direction and is turned into an on-state light beam reflected in the front direction by the micromirror, and is reflected in the other tilt direction. The light incident on the tilted micromirror is reflected by the micromirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light-absorbing plate. An image is displayed by dark display by reflection on the screen.

  The light source device 61 includes a discharge lamp 62 such as a high-pressure halogen lamp, a spheroidal reflector 63 whose inner surface is a reflection surface, and an explosion-proof filter that closes an opening in front of the reflector 63. The lead wire 74 is connected to the lamp power supply circuit 102 to supply power to the discharge lamp 62.

  The color wheel 86 has a thin disk shape, has a color filter for sequentially coloring white light emitted from the light source device 61 on a plane, and an optical axis between the light source device 61 and the light guide rod 81. The color filter is arranged on the top. Further, the center of the color wheel 86 is connected to a wheel motor 87 to control the rotation, and although not shown, the front surface, the back surface, and the outer peripheral edge are covered with a wheel cover. The wheel cover protects the color wheel 86 and prevents unnecessary light such as diffused light included in the light emitted from the light source device 61 from passing through the color wheel and affecting the subsequent optical system. Therefore, such unnecessary light is shielded on the front side or the back side of the color wheel 86.

  The light guide rod 81 has a rectangular parallelepiped shape having an entrance surface and an exit surface, and the light beam emitted from the light source device 61 is made uniform by the color wheel 86 and emitted to the subsequent optical system. As shown in FIG. 4, the rod holder 130 is fixed to the rod holder 130. The rod holder 130 has a plurality of light shielding plates that are in close contact with the rod mounting table 131 and the periphery of the light guide rod 81. And 132.

  As shown in FIG. 5, the rod mounting table 131 includes a pedestal portion 133 on which the light guide rod 81 is mounted, and a rod support portion 134 that is formed on the upper surface of the pedestal portion 133 and supports the light guide rod 81. The light shielding plate fixing portion 136 for fixing the light shielding plate 132 is formed at the ends of the base portion 133 and the rod support portion 134. Further, when the light guide rod 81 is fixed to the rod mounting table 131, at least the incident surface side of the light guide rod 81 is slightly protruded from the end of the rod mounting table 131.

  Further, the pedestal part 133 is a rectangular parallelepiped shape and is formed to have a length in the longitudinal direction shorter than that of the light guide rod 81, and the side surface of the incident side end part serves as the first light shielding plate fixing part 136a. The light shielding plate fixing portion 136a includes a fixture receiver 137a to which a fixing tool such as a screw used for fixing the light shielding plate 132 is fixed, and a support for supporting the light shielding plate 132 when the light shielding plate 132 is fixed to the rod mounting table 131. A projection 138 is provided. And this pedestal part 133 has a rod support part 134 at one side end of the upper surface, and the side surface of the light guide rod 81 placed on the upper surface of the pedestal part 133 is supported by this rod support part 134, A rod receiving portion 135 is formed to protrude from the surface of the pedestal 133 and the rod support portion 134 on which the light guide rod 81 is disposed, and a part of the surface of the light guide rod 81 is supported by the rod receiving portion 135. I have to.

  Further, the rod support part 134 has a rectangular parallelepiped shape and is formed to have a shorter length in the longitudinal direction than the light guide rod 81, and the side surface of the incident side end part serves as a second light shielding plate fixing part 136b. The two light shielding plate fixing portions 136b protrude slightly forward from the first light shielding plate fixing portion 136a of the pedestal portion 133 to form a step with respect to the first light shielding plate fixing portion 136a, and fix the light shielding plate 132. For this purpose, a fixture receiver 137b to which a fixture such as a screw used is fixed is provided. The rod support part 134 is disposed along one side end of the upper surface of the pedestal part 133. The rod support part 134 is integrally formed with the pedestal part 133 to form a rod mounting table 131. Thus, the light guide rod 81 is fixed.

  The above-described support protrusion 138 includes a straight line drawn in parallel to the bottom surface of the light guide rod 81 from the fixture receiver 137a formed on the first light shield plate fixing portion 136a, and the light guide rod from the second light shield plate fixing portion 136b. It is located at the intersection of a straight line drawn parallel to the side surface of 81.

  The plurality of light shielding plates 132 are provided with rod contact portions 143 having the same shape as a part of the side surface of the light guide rod 81, and in this embodiment, as shown in FIGS. 6 (a) and 6 (b). The first light shielding plate 141 and the second light shielding plate 142 are used. The light shielding plate 132 blocks diffused light or the like that does not pass through the light guide rod 81 that is not required in the light bundle emitted from the light source device 61, and the unnecessary light is transmitted to the display element 51 more than the light guide rod 81. This prevents light from entering the optical system on the side.

  As shown in FIG. 6 (a), the first light shielding plate 141 has a disk shape with an opening at the center and a part cut away, and extends from a predetermined position on the disk surface toward the outer periphery. And a rod contact portion 143a that is in close contact with the side surface and bottom surface of the light guide rod 81 formed by cutting at right angles, and the rod contact portion that is in close contact with the bottom surface of the light guide rod 81 in the vicinity of the rod contact portion 143a. A fixing tool through hole 144a and an adjustment notch 145a are provided on a straight line parallel to a predetermined side of 143a. The adjustment cutout 145a is formed so as to cut out from a predetermined position on the straight line to the outer periphery of the first light shielding plate 141. The fixture through-hole 144a is formed larger than the outer diameter of a screw or the like as the fixture, and has play between the periphery of the fixture and the circumference of the fixture through-hole 144a. Is.

  Further, as shown in FIG. 6B, the second light shielding plate 142 is an L-shaped plate-like body in which L-shaped rod contact portions 143b that are in close contact with the side and bottom surfaces of the light guide rod 81 are formed on the inner side. The fixing tool through hole 144b and the adjustment notch 145b are formed in parallel with a predetermined side of the rod contact portion 143b that is in close contact with the side surface of the light guide rod 81, and the adjustment notch 145b is parallel to this side. It is formed so as to be cut out from a predetermined position on the straight line to the outer peripheral edge. Furthermore, the fixture through hole 144b is formed larger than the periphery of a screw or the like as the fixture, and has play between the periphery of the fixture and the circumference of the fixture through hole 144b. .

  Then, as shown in FIG. 7, the rod holder 130 of the present embodiment first locks the adjustment notch 145a of the first light shielding plate 141 on the support protrusion 138 of the first light shielding plate fixing portion 136a to guide the light. The support protrusion 138 is adjusted as a fulcrum so that the outer peripheral edge of the rod 81 and the rod contact portion 143a are in close contact with each other, and the fixture receiver 137a of the first light shielding plate fixing portion 136a and the fixture through hole 144a of the first light shielding plate 141 are Fix using a screw or the like as a fixture. At this time, since play is provided between the circumference of the fixture through hole 144a and the periphery of the fixture, the close contact state between the rod contact portion 143a and the outer periphery of the light guide rod 81 can be finely adjusted.

  Next, as shown in FIG. 4, the adjustment notch 145b of the second light shielding plate 142 is supported in the direction in which the rod close portion 143a of the first light shielding plate 141 and the rod close contact portion 143b of the second light shielding plate 142 are opposed to each other. The support projection 138 is adjusted as a fulcrum so that the outer peripheral edge of the light guide rod 81 and the rod contact portion 143b of the second light shielding plate 142 are brought into close contact with the projection 138, and the fixture receiving member of the second light shielding plate fixing portion 136b 137b and the fixture through-hole 144b of the second light shielding plate 142 are fixed using a screw or the like as a fixture. At this time, as with the first light shielding plate 141, since there is play between the circumference of the fixture through hole 144b and the periphery of the fixture, the rod contact portion 143b and the outer periphery of the light guide rod 81 are in close contact with each other. You can fine-tune the state.

  Then, by shielding the light guide rod 81 with the first light shielding plate 141 and the second light shielding plate 142 in this way, the outer peripheral edge of the light guide rod 81 and the light shielding plate 132 are connected as shown in FIG. Can be intimate. In addition, since a step is formed between the first light shielding plate fixing portion 136a and the second light shielding plate fixing portion 136b, even if the light shielding plates 141 and 142 are arranged so as to overlap each other, there is no physical interference and no gap is formed. Fine adjustment is also possible by play of the fixture through hole 144.

  Further, when the rod holder 130 is disposed in the projector, a wheel motor 87 for controlling the color wheel 86 is located in the opening located at the center of the first light shielding plate 141, and the first light shielding plate 141 is the color wheel 86. It is a part of the wheel cover that is positioned behind the rear side of the color wheel 86 and protects the back side of the color wheel 86. Thereby, not only the light shielding of the light guide rod 81 but also the diffused light from the color wheel 86 can be removed.

  The light source side lens group in the light source side optical system 70 condenses the light bundle transmitted through the color wheel 86 and the light guide rod 81, eliminates diffused light that becomes unnecessary light, etc., and applies the light bundle to the reflection mirror 88. Irradiation.

  The reflection mirror 88 reflects the light emitted from the light source device 61 and transmitted through the light guide rod 81, the color wheel 86, and the light source side lens group toward the display element 51, thereby causing the display element 51 to have a front surface. Light is projected from a direction inclined in one direction with respect to the direction.

  The projection-side optical system 90 includes a fixed lens barrel containing a fixed lens group 98 and a movable lens group 97 which is engaged with the fixed lens barrel and can move forward and backward in the axial direction by a rotating operation. The projection-side optical system 90 includes a lens barrel and forms a zoom lens by a combination of a plurality of lenses incorporated in these lens barrels.

  As described above, the projector 1 emits light from the light source device 61 in one direction and rotates the color wheel 86 at a high speed, so that the light is incident on the incident surface of the light guide rod 81 from the light source device 61. The light emitted from the exit surface of 81 is made uniform in intensity distribution by the light guide rod 81, further colored sequentially by the color wheel 86, and projected toward the display element 51 by the light source side optical system 70 and the reflection mirror 88. It is something that can be done.

  When the light from the light source device 61 is stabilized after a lapse of a predetermined time since the power is turned on, each color is displayed on the display element 51 in synchronization with the projection period of the colored light transmitted through the color wheel 86. By sequentially writing the image data, a single color image of each color is sequentially formed on the display element 51 by the on-state light beam reflected in the front direction of the display element 51, and single color image light of each color sequentially emitted from the display element 51 is projected. The image is enlarged by the lens groups 97 and 98 of the side optical system 90 and projected onto the projection surface, and a full-color image in which the three monochromatic images are superimposed on the projection surface is displayed.

  According to the present embodiment, the rod holder 130 for fixing the light guide rod 81 is formed by the rod mounting base 131 and the plurality of light shielding plates 132 in close contact with the periphery of the light guide rod 81, whereby the light guide rod 81 can be fixed and shielded, and the light guide rod 81 can be easily fixed and shielded.

  Further, by forming the rod mounting table 131 with a pedestal part 133 having a light shielding plate fixing part 136 at the end and a rod support part 134, a light shielding plate fixing tool or the like for newly fixing the light shielding plate 132 is installed. This is unnecessary, and the plurality of light shielding plates 132 can be easily fixed.

  Further, a step is formed between the first light shielding plate fixing portion 136a of the pedestal portion 133 and the second light shielding plate fixing portion 136b of the rod support portion 134, and the plurality of light shielding plates 132 are overlapped and fixed. Since the plurality of light shielding plates 132 are not physically interfered with each other, distortion of the light shielding plates 132 due to physical interference is eliminated, and a gap through which unnecessary light or the like is transmitted can be eliminated.

  Further, by forming the fixture receivers 137a and 137b and the support protrusion 138 on the light shielding plate fixing portion 136, the fixture receivers 137a and 137b and the support projection 138 can fix the light shielding plate 132 to the light shielding plate fixing portion 136. The position where the light shielding plate 132 is fixed becomes clear.

  The light shielding plate 132 includes a rod close-contact portion having the same shape as a part of the side surface of the light guide rod 81, whereby the side surface of the light guide rod 81 and the light shielding plate 132 can be brought into close contact with each other. The holding power of 81 also becomes strong.

  Further, the light shielding plate 132 is brought into intimate contact with the light guide rod 81 by forming a fixing tool through hole 144 having play between the light shielding plate 132 and a peripheral edge of a fixing device such as a screw, and an adjustment notch 145. Fine adjustment for this is facilitated.

  Further, by using the first light shielding plate 141 and the second light shielding plate 142 provided with the L-shaped rod contact portion 143 as the light shielding plate 132, a rectangular parallelepiped light guide rod 81 generally used as a light guide device for a projector. And the light shielding plate 132 can be arranged in close contact with each other.

  Further, the first light shielding plate 141 is shaped like a disk, the motor shaft of the wheel motor 87 is passed through the center of the first light shielding plate 141, and the wheel motor is located near the pedestal 133 behind the first light shielding plate 141. 87 is fixed and the color wheel 86 is disposed in front of the first light shielding plate 141, so that the first light shielding plate 141 is a part of the wheel cover, thereby shielding the light guide rod 81 and transmitting the color wheel 86. The unnecessary light can be shielded at the same time, and since one member has two functions, the space in the housing of the projector 1 can be used effectively, and the projector 1 can be downsized.

  In the projector 1 using such a rod holder 130, since there is no gap between the light guide rod 81 and the light shielding plate 132, unnecessary light can be removed and a high-quality projected image can be provided. In addition, the projector 1 can be easily downsized and manufactured.

In the above-described embodiment, the rectangular parallelepiped light guide rod 81 is used. However, when the shape of the light guide rod 81 changes, the light guide rod 81 can be changed by changing the shape of the rod contact portion 143 of the light shielding plate 132. The side surface of the rod 81 and the light shielding plate 132 can be brought into close contact with each other.
Further, the number of light shielding plates 132 is not limited to two, and for example, it is also possible to bring the light guiding rods 81 into close contact with the top, bottom and side surfaces of the light guiding rods 81 using four light shielding plates 132. .

  In addition, this invention is not limited to the form of the above Example, A change and improvement are possible freely in the range which does not deviate from the summary of invention.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. 1 is a schematic diagram schematically showing the inside of a projector according to an embodiment of the invention. The perspective view of the rod holder which concerns on the Example of this invention. The perspective view which removed the light-shielding plate of the rod holder which concerns on the Example of this invention. The front view of the light-shielding plate which concerns on the Example of this invention. The perspective view which removed the 2nd light-shielding plate of the rod holder which concerns on the Example of this invention. The front view of the rod holder which concerns on the Example of this invention.

Explanation of symbols

1 Projector 2 Top plate
3 Front plate 4 Back plate
5 Right side plate 6 Left side plate
8 Exhaust hole 9 Intake hole
10 Power switch 11 Power indicator
12 Manual image quality adjustment key 13 Automatic image quality adjustment key
14 Light source indicator 15 Overheat indicator
16 Loudspeaker 17 Open / close lid
18 Forefoot member 19 Rear foot member
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
61 Light source device 62 Discharge lamp
63 Reflector 70 Light source side optical system
74 Lead wire 81 Light guide rod
86 Color wheel 87 Wheel motor
88 Reflective mirror 90 Projection side optical system
92 Lens cover 93 Projection port
97 Movable lens group 98 Fixed lens group
101 Projector control means 102 Lamp power supply circuit
103 Circuit board 111 Cooling fan
130 Rod holder 131 Rod mount
132 Shading plate 133 Base
134 Rod support 135 Rod support
136 Shading plate fixing part 136a First shading plate fixing part
136b Second shading plate fixing part
137a, 137b Fixture receptacle
138 Support protrusion
141 1st shading plate 142 2nd shading plate
143,143a, 143b Rod close contact
144,144a, 144b Fixture through hole
145,145a, 145b Adjustment notch

Claims (8)

A rod mounting table;
A rod holder having a plurality of light-shielding plates fixed to an end side surface of the rod mounting table and in close contact with a periphery of a light guide rod mounted and fixed on the rod mounting table. The rod mounting table includes a pedestal portion for mounting the light guide rod, and a rod support portion for supporting the light guide rod mounted on the pedestal portion,
The ends of the pedestal part and the rod support part are light shielding plate fixing parts,
The light shielding plate fixing portion formed at the end of the pedestal portion includes a fixture receiver and a support protrusion that supports the adjustment when adjusting the fixing positions of the plurality of light shielding plates,
The rod holder according to claim 1, wherein the light-shielding plate fixing portion formed at the end of the rod support portion includes a fixture receiver. A step is provided between the light shielding plate fixing portion of the pedestal portion and the light shielding plate fixing portion of the rod support portion,
The rod holder according to claim 2, wherein the plurality of light shielding plates are fixed in an overlapping manner.   The rod holder according to any one of claims 1 to 3, wherein the plurality of light shielding plates include a rod close contact portion having the same shape as a part of a side surface of the light guide rod. The light shielding plate has two light shielding plates, a first light shielding plate and a second light shielding plate,
The first light shielding plate has a disc-shaped L-shaped rod contact portion by a notch cut at right angles to the outer periphery,
5. The rod holder according to claim 4, wherein the second light shielding plate is an L-shaped plate-like body and has an inner side as a rod close contact portion. The shading plate includes a fixing tool through hole through which the fixing tool passes, and an adjustment notch for locking with a support protrusion formed on the pedestal portion,
The rod holder according to any one of claims 2 to 5, wherein the fixture through hole has play between the fixture and the periphery of the fixture when the fixture is inserted. A light source device;
A light guide rod and a rod holder;
Color wheel,
A light source side optical system;
A display element;
A projection-side optical system;
A cooling fan,
Projector control means,
The rod holder is
A rod mounting table;
A projector comprising: a plurality of light shielding plates fixed to an end side surface of the rod mounting table and in close contact with a periphery of a light guide rod mounted and fixed on the rod mounting table. The projector according to claim 7, wherein a predetermined one of the plurality of light shielding plates is disposed behind the color wheel to form a part of a wheel cover.

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